[Mgs] Locking gas cap for 79 MGB

[Howard Battan]

I've been looking for a locking gas cap for my '79 B, with no luck online or 
at the local parts houses. Today I was on a tour with other MGBs, and two of 
them had locking gas caps, but neither of the owners knew where to get them. 
One was ordered from the UK, and I found some on UK sites, but they say they 
are not for US or Canada use. Is that because they are vented? My B has been 
desmogged, so I don't know if those caps would work or not.

So, does anybody know of a source for a locking gas cap for a desmogged late 
model B?

TIA

Howard Battan
54 TF
57 A
79 B